New upstream version 1.0.29upstream/1.0.29

1 files changed, 238 insertions, 0 deletions

diff --git a/backend/genesys/conv.cpp b/backend/genesys/conv.cpp
new file mode 100644
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--- /dev/null
+++ b/backend/genesys/conv.cpp
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2005, 2006 Pierre Willenbrock <pierre@pirsoft.dnsalias.org>
+   Copyright (C) 2010-2013 Stéphane Voltz <stef.dev@free.fr>
+
+   This file is part of the SANE package.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+*/
+
+#define DEBUG_DECLARE_ONLY
+
+#include "conv.h"
+#include "sane/sanei_magic.h"
+
+namespace genesys {
+
+/**
+ * uses the threshold/threshold_curve to control software binarization
+ * This code was taken from the epjistsu backend by m. allan noah
+ * @param dev device set up for the scan
+ * @param src pointer to raw data
+ * @param dst pointer where to store result
+ * @param width width of the processed line
+ * */
+void binarize_line(Genesys_Device* dev, std::uint8_t* src, std::uint8_t* dst, int width)
+{
+    DBG_HELPER(dbg);
+  int j, windowX, sum = 0;
+  int thresh;
+  int offset, addCol, dropCol;
+  unsigned char mask;
+
+  int x;
+    std::uint8_t min, max;
+
+  /* normalize line */
+  min = 255;
+  max = 0;
+    for (x = 0; x < width; x++)
+      {
+	if (src[x] > max)
+	  {
+	    max = src[x];
+	  }
+	if (src[x] < min)
+	  {
+	    min = src[x];
+	  }
+      }
+
+    /* safeguard against dark or white areas */
+    if(min>80)
+	    min=0;
+    if(max<80)
+	    max=255;
+    for (x = 0; x < width; x++)
+      {
+	src[x] = ((src[x] - min) * 255) / (max - min);
+      }
+
+  /* ~1mm works best, but the window needs to have odd # of pixels */
+  windowX = (6 * dev->settings.xres) / 150;
+  if (!(windowX % 2))
+    windowX++;
+
+  /* second, prefill the sliding sum */
+  for (j = 0; j < windowX; j++)
+    sum += src[j];
+
+  /* third, walk the input buffer, update the sliding sum, */
+  /* determine threshold, output bits */
+  for (j = 0; j < width; j++)
+    {
+      /* output image location */
+      offset = j % 8;
+      mask = 0x80 >> offset;
+      thresh = dev->settings.threshold;
+
+      /* move sum/update threshold only if there is a curve */
+      if (dev->settings.threshold_curve)
+	{
+	  addCol = j + windowX / 2;
+	  dropCol = addCol - windowX;
+
+	  if (dropCol >= 0 && addCol < width)
+	    {
+	      sum -= src[dropCol];
+	      sum += src[addCol];
+	    }
+	  thresh = dev->lineart_lut[sum / windowX];
+	}
+
+      /* use average to lookup threshold */
+      if (src[j] > thresh)
+	*dst &= ~mask;		/* white */
+      else
+	*dst |= mask;		/* black */
+
+      if (offset == 7)
+	dst++;
+    }
+}
+
+/**
+ * software lineart using data from a 8 bit gray scan. We assume true gray
+ * or monochrome scan as input.
+ */
+void genesys_gray_lineart(Genesys_Device* dev,
+                          std::uint8_t* src_data, std::uint8_t* dst_data,
+                          std::size_t pixels, std::size_t lines, std::uint8_t threshold)
+{
+    DBG_HELPER(dbg);
+    std::size_t y;
+
+    DBG(DBG_io2, "%s: converting %zu lines of %zu pixels\n", __func__, lines, pixels);
+  DBG(DBG_io2, "%s: threshold=%d\n", __func__, threshold);
+
+  for (y = 0; y < lines; y++)
+    {
+      binarize_line (dev, src_data + y * pixels, dst_data, pixels);
+      dst_data += pixels / 8;
+    }
+}
+
+/** Look in image for likely left/right/bottom paper edges, then crop image.
+ */
+void genesys_crop(Genesys_Scanner* s)
+{
+    DBG_HELPER(dbg);
+  Genesys_Device *dev = s->dev;
+  int top = 0;
+  int bottom = 0;
+  int left = 0;
+  int right = 0;
+
+    // first find edges if any
+    TIE(sanei_magic_findEdges(&s->params, dev->img_buffer.data(),
+                              dev->settings.xres, dev->settings.yres,
+                              &top, &bottom, &left, &right));
+
+  DBG (DBG_io, "%s: t:%d b:%d l:%d r:%d\n", __func__, top, bottom, left,
+       right);
+
+    // now crop the image
+    TIE(sanei_magic_crop (&(s->params), dev->img_buffer.data(), top, bottom, left, right));
+
+  /* update counters to new image size */
+  dev->total_bytes_to_read = s->params.bytes_per_line * s->params.lines;
+}
+
+/** Look in image for likely upper and left paper edges, then rotate
+ * image so that upper left corner of paper is upper left of image.
+ */
+void genesys_deskew(Genesys_Scanner *s, const Genesys_Sensor& sensor)
+{
+    DBG_HELPER(dbg);
+  Genesys_Device *dev = s->dev;
+
+  int x = 0, y = 0, bg;
+  double slope = 0;
+
+  bg=0;
+  if(s->params.format==SANE_FRAME_GRAY && s->params.depth == 1)
+    {
+      bg=0xff;
+    }
+    TIE(sanei_magic_findSkew(&s->params, dev->img_buffer.data(),
+                             sensor.optical_res, sensor.optical_res,
+                             &x, &y, &slope));
+
+    DBG(DBG_info, "%s: slope=%f => %f\n", __func__, slope, slope * 180 / M_PI);
+
+    // rotate image slope is in [-PI/2,PI/2]. Positive values rotate trigonometric direction wise
+    TIE(sanei_magic_rotate(&s->params, dev->img_buffer.data(),
+                           x, y, slope, bg));
+}
+
+/** remove lone dots
+ */
+void genesys_despeck(Genesys_Scanner* s)
+{
+    DBG_HELPER(dbg);
+    TIE(sanei_magic_despeck(&s->params, s->dev->img_buffer.data(), s->despeck));
+}
+
+/** Look if image needs rotation and apply it
+ * */
+void genesys_derotate(Genesys_Scanner* s)
+{
+    DBG_HELPER(dbg);
+  int angle = 0;
+
+    TIE(sanei_magic_findTurn(&s->params, s->dev->img_buffer.data(),
+                             s->resolution, s->resolution, &angle));
+
+    // apply rotation angle found
+    TIE(sanei_magic_turn(&s->params, s->dev->img_buffer.data(), angle));
+
+    // update counters to new image size
+    s->dev->total_bytes_to_read = s->params.bytes_per_line * s->params.lines;
+}
+
+} // namespace genesys